A capsule of plastic material particularly for infusion bottles

Abstract: A capsule of plastic material for infusion bottles, comprising a capsule body (1) to be fitted on a neck of a bottle for retaining a pierceable plug (5) in place and a capsule cap (10) to be fitted on said capsule body (1), wherein said capsule body has a hole (8) formed on the top wall (4) thereof and a downwardly extending annular ridge (9) formed around and at a distance to said hole and said capsule cap (10) includes a plug (12) for fitting into said hole (8), said plug (12) being provided on its circumference with an annular rim (14) designed to be folded outwarly for fitting in a space that is defined by the bottle closing plug (5) the capsule body wall (4) and the annular ridge (9) with respect to each other.

Description: This invention provides a capsule of plastic material particularly for infusion bottles and the like. The capsule according to the invention comprises a capsule body for fitting to a bottle neck to retain a rubber plug in place, said capsule body being formed with a central hole that is surrounded, at a short distace thereto, by an annular ridge formed on the lower wall, and a capsule cap provided with a cylindrical plug for closing said hole in the capsule body, said plug having an annular edge that can be folded outwardly so as to fit below said capsule body close to said annular ridge in order to retain the cap in place. Once the capsule body with its associate cap is fixed in place, the lower flat wall of this body will be in contact with the closing plug of the bottle thereby to prevent air pockets from forming between the capsule and the cap and to be helpful in maintaining conditions or sterilization. It is known that bottles for containing drugs such as infusion liquids or the like are generally closed by a pierceable rubber plug which is retained in place by means of a capsule of aluminium, this aluminium capsule being secured by seaming to the bottle neck to cover the entire rubber cap. This capsule has a weakening line formed on its central wall for permitting a central portion of the capsule wall to be easily removed to give access to the underlying rubber plug so that this latter can be pierced to draw off a product. Aluminium capsules involve, however, some disadvantages. First of all, they cannot be mounted while being maintained in a sterilized environment because the sheet folding operation that is necessary to fix by seaming the capsule to a bottle neck causes a certain quantity of aluminium powder to be produced, whose dispersion in the environment would destroy the sterilized condition. The same as above occurs with lubricant that has to be used in machines for manufacturing aluminium capsules. As a result, aluminium capsules are mounted in a not sterilized environment. Moreover, it frequently occurs that an user will get cut or will hurt himself in pulling up this material. It would then be desirable that a different material i.e. a material which does not involve the above-described described problems could be resorted to and such, as a plastic material, for example. Several efforts have been made to this end but none of them was brought to a successful result. Plastic material, in effect, either does not withstand such high temperatures as required for autoclaving, or it is expanded and/or distorted to such an extent that it cannot secure sterilized conditions to be maintained inside the capsule. Conversely, when using a material that withstands high temperatures and is of sufficient thickness to avoid excessive distorsion, the resulting capsule is too much thick and is difficult to rupture for removing the cap. EP-A-0 291 658 disclosed a capsule of plastic material for infusion bottles, of the type comprising a capsule body to be fitted on a neck of the bottle for retaining a pierceable plug in place and a capsule cap to be fitted on said capsule body. The capsule body has a hole formed on tis top wall, whereby said capsule cap includes a plug for fitting into said hole, said plug being provided on tis circumference wit an annular rim designed to be folded outwardly. The preamble of claim 1 is based on this prior art. The invention relates to a capsule of this kind, having the feature indicated in the characterizing par of the appended claims. The capsule according to the invention may also be provided with a guarantee ring further securing the end user against any tampering. The invention will now be described in detail with reference to the accompanying drawing, in which: Figure 1 is a sectional view of a capsule body according to the invention; Figure 2 is a sectional view of one type of capsule cap for fitting to the capsule body in figure 1, this capsule cap being provided with a grip ring on its circumference; Figure 3 is a partial sectional view of the capsule fitted with the cap; Figure 4 is a sectional view of a capsule according to the invention provided with a guarantee seal; Figure 5 is a sectional view of a different embodiment of a cap for a capsule according to the invention; Figure 6 is a partial sectional view of the capsule of figure 4 with the cap of figure 5 fitted thereto. A capsule body of the invention is generally designated with 1 in figure 1 and comprises a side wall 2 for fitting around the neck of a bottle 3 and a top wall 4 adapted to rest on a rubber, pierceable plug 5 closing the bottle 3. The capsule body 1 has on a lower internal edge thereof an annular ridge 6 for engagement with a, correspoding ridge on an external edge of the bottle to retain the capsule in place. The annular ridge 6 is discontinuous, i.e. it is formed of a number of ridge portions spaced apart by a distance as shown at 7, the reason for this solution being that inasmuch as it permits the capsule body to undergo a greater elastic deformation upon its putting in place, the ridge 6 can be given a more protruding shape thereby to ensure that a more firm grip on the neck of the bottle can be obtained. Provided in a central position on the top 4, is a hole 8 while on the lower surface of wall 4 close to, but slightly spaced from this hole 8, a downwardly extending annular ridge 9 is formed. The annular ridge 9 is designed so that after the capsule has been fitted to the bottle neck, said ridge 9 will rest on the plug 5. The capsule is closed by a capsule cap generally designated with 10 in figure 2, which has a grip ring 11 on its circumference and a closing plug generally indicated by 12 at a central area thereof for fitting into hole 8 in the capsule body. The lower wall 13 of cap 12 is flat and is defined circumferentially by an annular rim 14. This rim 14 is adapted to be folded ouwardly for engaging below the wall 4 of the capsule body, inside the annular ridge 9. The thickness of rim 14 is substantially the same as the height of annular ridge 9 such that when the folded rim is fitted below the wall 4 of the capsule body it will substantially be in alignment with both the lower face 13 of plug 12 and the lower face of annular ridge 9. As a result, these three elements are coplanar to each other and they rest on the bottle closing cap 5 as shown in figure 3. In this way, air pockets are prevented from forming between the capsule and the cap, thereby ensuring that sterilized condition can be maintained. The cap 10 is fixed, for example, by heat-sealing and can be easily removed by simply grasping the ring 11 and then tearing up the cap from its seat to get access to the underlying pierceable plug. Other forms of cap such, for example, as that in figure 5 may be used, provided that a closing plug having the features as described above is still provided in the central area of the cap and is designed so as to fit into hole 8 of the capsule body. Moreover, the capsule may be possibly provided with a guarantee seal, as for example a strip 15 of plastic material (figures 4 and 6) which is connected by bridges 16 to the capsule body and is ruptured if the capsule is removed from the bottle. As a matter of fact both the dimensions and the used materials may be varied depending on particular application requirements.

Claims: A capsule of plastic material for infusion bottles, of the type comprising a capsule body (1) to be fitted on a neck of the bottle for retaining a pierceable plug (5) in place and a capsule cap (10) to be fitted on said capsule body (1), said capsule body having a hole (8) formed on its top wall (4) whereby said capsule cap (10) includes a plug (12) for fitting into said hole (8), said plug (12) being provided on its circumference with an annular rim (14) designed to be folded outwardly characterized in that the underside of the top wall of the capsule body is provided with a downwardly extending annular ridge (9) formed around and at a distance to said hole, the outwardly folded rim (14) fits into the space that is defined by the bottle closing plug (5), the top wall (4) of the capsule body and the annular ridge (9). The capsule of plastic material according to claim (1), wherein the thickness of said annular rim (14) is substantially the same as the height of said annular ridge (9) such that after said annular rim (14) has been folded this rim (14) will be in alignment with both the lower wall (13) of plug (12) and the bottom edge of annular ridge (9). The capsule of plastic material according to any preceding claim wherein said capsule body has an internal annular ridge (6) formed on a lower edge thereof for engaging with a corresponding ridge on an edge of a bottle, said annular ridge (6) being in the form of a number of ridge portions spaced by a distance (7) from one another. The capsule of plastic material according to any preceding claim wherein the capsule is provided with a grip ring (11) secured to said closing cap (10). The capsule of plastic material according to any preceding claim wherein both said closing cap (10) and said closing ring (11) are fixed by heat-sealing to said capsule body. The capsule of plastic material according to any preceding claim, characterized in that the height of said plug (12) of capsule cap (10) is equal to the thickness of wall (4) of the capsule body plus the height of annular ridge (9), such that when the cap (10) has been fitted on the capsule body (1) the lower wall (13) of plug (12) and the bottom edge of annular rim (9) are on a same plane to rest against the closing plug (5). The capsule of plastic material according to any preceding claim, wherein a guarantee seal is provided and consists of a strip means fixedly connected to the capsule body through a plurality of bridges which are ruptured as a result of tampering attempt.

Inventors: RIZZARDI VANNA POZZONI, RIZZARDI, VANNA POZZONI
Applicants: CAPSULIT SRL, CAPSULIT S.P.A.
Application year: 1994
Main classification: B65D51
IPC codes: B65D51